Separable and non-separable multi-field inflation and large non-Gaussianity
arXiv:1203.3558 · doi:10.1088/1475-7516/2012/09/005
Abstract
In this paper we provide a general framework based on formalism to estimate the cosmological observables pertaining to the cosmic microwave background radiation for non-separable potentials, and for generic \emph{end of inflation} boundary conditions. We provide analytical and numerical solutions to the relevant observables by decomposing the cosmological perturbations along the curvature and the isocurvature directions, \emph{instead of adiabatic and entropy directions}. We then study under what conditions large bi-spectrum and tri-spectrum can be generated through phase transition which ends inflation. In an illustrative example, we show that large and can be obtained for the case of separable and non-separable inflationary potentials.
21 pages, 6 figures
References in corpus (16)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
- Reheating in Inflationary Cosmology: Theory and Applications
- Gauge invariant MSSM inflaton
- Non-Gaussianities in two-field inflation
- Primordial trispectrum from inflation
- Multi-brid inflation and non-Gaussianity
- Non-Gaussianity from Preheating
- Fitting the Gamma-Ray Spectrum from Dark Matter with DMFIT: GLAST and the Galactic Center Region
- Large non-Gaussianity from multi-brid inflation
- Primordial Non-Gaussianity in Multi-Scalar Slow-Roll Inflation
- Non-Gaussianity from Instant and Tachyonic Preheating
- Moment transport equations for the primordial curvature perturbation
- Negative spectral index of in the axion-type curvaton model
- Nonlinear curvature perturbations in an exactly soluble model of multi-component slow-roll inflation
- The origin of dark matter, matter-anti-matter asymmetry, and inflation